| 摘要 |
A method of measuring the density of an aerated liquid in a flowing supply of aerated liquid comprises passing sound vibrations through a portion (9) of the liquid supply and utilising the velocity of the sound through that liquid supply portion as a measure of the density, the pressure of that liquid supply portion being controlled (by 10; 13). A flow line (2) of aerated liquid is provided with a branch connection (3) to a branch line (9, 5, 7) which includes a through-flow density meter (4), a pressure transducer (8) being connected to the branch line for measuring the pressure in the branch line. |
